<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>清除默认样式</title>
    <style>
          /* *{
            margin: 0;
            padding: 0;
          } */
           /* 清除列表项目符号 */
          li{
            list-style: none;
          }
    </style>
</head>

<body>
    <h1>标题</h1>
    <p>pppp</p>
    <ul>
        <li>li</li>
    </ul>
</body>

</html>